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AK · NOAA 9497645 · 70° 25′ N · 148° 32′ W
Tides at Prudhoe Bay
A mixed, mainly semidiurnal tide (form factor 0.61), spring this week. Predicted from the station's 23 harmonic constants; heights above mean lower low water, times in station time. Weather is not in these numbers.
This week
| When | Water | Height |
|---|---|---|
| Sun, Oct 25, 12:56 PM | High | 0.4 ft |
| Sun, Oct 25, 6:41 PM | Low | -0.1 ft |
| Mon, Oct 26, 1:30 AM | High | 0.8 ft |
| Mon, Oct 26, 8:08 AM | Low | -0.0 ft |
| Mon, Oct 26, 1:23 PM | High | 0.4 ft |
| Mon, Oct 26, 7:12 PM | Low | -0.2 ft |
| Tue, Oct 27, 2:09 AM | High | 0.9 ft |
| Tue, Oct 27, 8:45 AM | Low | 0.0 ft |
| Tue, Oct 27, 1:50 PM | High | 0.4 ft |
| Tue, Oct 27, 7:45 PM | Low | -0.2 ft |
| Wed, Oct 28, 2:49 AM | High | 0.8 ft |
| Wed, Oct 28, 9:24 AM | Low | 0.1 ft |
| Wed, Oct 28, 2:17 PM | High | 0.4 ft |
| Wed, Oct 28, 8:22 PM | Low | -0.2 ft |
| Thu, Oct 29, 3:32 AM | High | 0.8 ft |
| Thu, Oct 29, 10:04 AM | Low | 0.1 ft |
| Thu, Oct 29, 2:46 PM | High | 0.4 ft |
| Thu, Oct 29, 9:03 PM | Low | -0.2 ft |
| Fri, Oct 30, 4:21 AM | High | 0.7 ft |
| Fri, Oct 30, 10:47 AM | Low | 0.2 ft |
| Fri, Oct 30, 3:19 PM | High | 0.3 ft |
| Fri, Oct 30, 9:51 PM | Low | -0.1 ft |
| Sat, Oct 31, 5:17 AM | High | 0.6 ft |
| Sat, Oct 31, 11:40 AM | Low | 0.2 ft |
| Sat, Oct 31, 4:05 PM | High | 0.3 ft |
| Sat, Oct 31, 10:54 PM | Low | -0.0 ft |
| Sun, Nov 1, 5:30 AM | High | 0.5 ft |
The constants that make it
| Constituent | Amplitude | Phase |
|---|---|---|
| SA | 0.4 ft | 145.3° |
| M2 | 0.2 ft | 275.7° |
| SSA | 0.2 ft | 249.0° |
| O1 | 0.1 ft | 186.8° |
| S2 | 0.1 ft | 314.9° |
| K1 | 0.1 ft | 158.4° |
| Q1 | 0.0 ft | 173.6° |
| N2 | 0.0 ft | 258.2° |
The eight largest of 23. Source: NOAA CO-OPS harmonic constituents for 9497645, public domain.
The year as a print
The last two days, measured
At Sun, Oct 25 12:24 the gauge read 2.7 ft, 2.3 ft above the computed curve: wind and pressure, not the moon. The widest gap of the two days was 2.4 ft, at Sun, Oct 25 08:36.
- Computed here, from the constants
- NOAA's own prediction
- Measured at the gauge, every six minutes
The last twelve hours as numbers
| Station time | Measured | Computed here | NOAA |
|---|---|---|---|
| Sun, Oct 25 01:00 | 2.92 ft | 0.79 ft | 0.79 ft |
| Sun, Oct 25 02:00 | 2.87 ft | 0.73 ft | 0.73 ft |
| Sun, Oct 25 03:00 | 2.69 ft | 0.59 ft | 0.59 ft |
| Sun, Oct 25 04:00 | 2.58 ft | 0.41 ft | 0.41 ft |
| Sun, Oct 25 05:00 | 2.44 ft | 0.22 ft | 0.22 ft |
| Sun, Oct 25 06:00 | 2.38 ft | 0.07 ft | 0.07 ft |
| Sun, Oct 25 07:00 | 2.35 ft | -0.02 ft | -0.01 ft |
| Sun, Oct 25 08:00 | 0.00 ft | -0.02 ft | -0.02 ft |
| Sun, Oct 25 09:00 | 2.42 ft | 0.05 ft | 0.06 ft |
| Sun, Oct 25 10:00 | 0.00 ft | 0.17 ft | 0.17 ft |
| Sun, Oct 25 11:00 | 2.67 ft | 0.30 ft | 0.30 ft |
| Sun, Oct 25 12:00 | 2.68 ft | 0.39 ft | 0.39 ft |
Measured heights from NOAA CO-OPS station 9497645, preliminary, above mean lower low water. The print carries the computed curve only: one year, no weather.